Welding composition.



UNITED STATES V OFFICE.

JOHN A. HOPE, OF MONTREAL. QUEBEC. CANADA.

WELDING COMPOSITION.

Io Drawing.

To all whom it may concern:

lie it known that I, Joux ALEXANDER Horn, of the city of Montreal, in the Province of Quebec, Dominion of Canada, have invented new and useful Improvements in \Velding Compositions; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates particularly to the welding of a cutting edge of high speed steel to a low carbon steel shank; and has for its object to enable a perfect weld to be obtained without the necessity of any separate process for rehardening the edge after the weld.

' The invention may be said broadly to consist of a welding mixture composed of ferrosilicon and burnt borax. More specifically stated,' it consists of a ferro-silicon and burnt. borax in the following proportions:

% F erro-silicou 50 parts Burnt b0I':lX; 50 parts drawn and while hot the faces to be Welded have the welding mixture applied thereto. The faces are then brought together and the article put in the press and there subjected to a light pressure, approximately 300 pounds for about half a minute. This pressure is varied according to the area of the face to be welded, the larger the face thev greater the pressure. The tool is then removed from the press, the edge member 1 being lightly attached to the shank, and the welding compo- Specifieation of Letters Patent.

Application filed September 1, 1916. Serial No. 118.137.

sition evenh distributed and closely packed between the faces. The tool is then given its tinal heating in thesame furnace, a forced blast being used and the temperature raised to the welding point, the white heat, say, for instance, with comparatively small tools from 2100 to 2300. This temperature causes the mixture between the faces to flow and when the flux is completed the tool is again withdrawn from the furnace and returned to the press where it is subjected to a final pressure of from approxin'iately 200 pounds to 1000 pounds according to the size of the tool and the area of the face being welded. and this pressure is maintained until all working of the fluxedcomposition ceases. A perfect weld is thus obtained. The tool is then removed from the press and the highspeed face is immediately subjected to a cold air blast thus giving to the cutting edge the required hardness to do any Work required of high-speed cutting tools.

I have found that my welding compositions when used with my process secure a perfect bond between the high-speed steel edge and low carbon steel shank, and actual test has proved that the Welded joint offers greater resistance to breakage than either the high-speed steel itself or the low grade iron.

Vhat I claim is as follows g 1. A high-speed steel and low carbon-iron welding composition consisting of ferro-silicon and burnt borax.

2. A high-speed steel andlow carbon iron welding composition consisting of 50% fer ro-silicon and burnt borax in equal proportions.

In testimony whereof I have signed my name to this specification in the presence of JOHN A. HOPE;

- two witnesses.

\Vitnesses:

Gonoox G. Cooxn, VILLIAM J. C. Hnwmson. 

